dip_2.cs

using System;

namespace dip_2
{
    class Program
    {
        static void Main(string[] args)
        {
            var bakery = new Restaurant("Bakery", new Oven());
            bakery.Cook("cookies");

            var crepery = new Restaurant("Crepery", new Stove());
            crepery.Cook("crepes");
        }
    }

    class Restaurant
    {
        public string Name { get; set; }

        public ICooker Cooker { get; set; }

        public Restaurant(string name, ICooker cooker)
        {
            this.Name = name;
            this.Cooker = cooker;
        }
        
        public void Cook(string item)
        {
            this.Cooker.TurnOn();
            this.Cooker.Cook(item);
            this.Cooker.TurnOff();
        }
    }

    interface ICooker
    {
        bool On { get; set; }

        void TurnOn();

        void TurnOff();

        void Cook(string item);
    }

    class Oven : ICooker
    {
        public bool On { get; set; }

        public void TurnOn()
        {
            Console.WriteLine("Turning on the oven!");
            this.On = true;
        }

        public void TurnOff()
        {
            Console.WriteLine("Turning off the oven!");
            this.On = false;
        }

        public void Cook(string item)
        {
            if (!this.On)
            {
                Console.WriteLine("Oven not turned on.");
            }
            else
            {
                Console.WriteLine("Now baking " + item + "!");
            }
        }
    }

    class Stove : ICooker
    {
        public bool On { get; set; }

        public void TurnOn()
        {
            Console.WriteLine("Turning on the stove!");
            this.On = true;
        }

        public void TurnOff()
        {
            Console.WriteLine("Turning off the stove!");
            this.On = false;
        }

        public void Cook(string item)
        {
            if (!this.On)
            {
                Console.WriteLine("Stove not turned on.");
            }
            else
            {
                Console.WriteLine("Now frying " + item + "!");
            }
        }
    }
}